Disperse dyes of the naphthoylene-benzimidazole series

ABSTRACT

WHEREIN X IS AN OXYGEN ATOM OR A TERTIARY AMINO GROUP, WHEN USED FOR THE COLORATION OF HYDROPHOBIC FULLY SYNTHETIC OR SEMI-SYNTHETIC FIBRES, DISPLAY GOOD FASTNESS TO LIGHT, WET AND TEMPERATURE TREATING.   -CO-N(-ALKYLENE-X-ACYL)-CO- DISPERSE DYES OF THE NAPHTHOYLENE-BENZIMIDAZOLE SERIES, HAVING IN THEIR MOLECULAR STRUCTURE A GROUP OF THE FORMULA

United States Patent 3,632,589 DISPERSE DYES OF THE NAPHTHOYLENE- BENZIMIDAZOLE SERIES Curt Mueller, Basel, and Ulrich Zirngibl, Binningen,

Basel-Land, Switzerland, assignors to Sandoz Ltd. (also known as Sandoz A.G.), Basel, Switzerland N0 Drawing. Filed Jan. 11, 1968, Ser. No. 697,004 Claims priority, application Switzerland, Jan. 20, 1967,

875/67 Int. Cl. C07d 49/30 US. Cl. 260-282 6 Claims ABSTRACT OF THE DISCLOSURE Disperse dyes of the naphthoylene-benzimidazole series, having in their molecular structure a group of the formula wherein X is an oxygen atom or a tertiary amino group, when used for the coloration of hydrophobic fully synthetic or semi-synthetic fibres, display good fastness to light, wet and temperature treating.

This invention relates to disperse dyes and mixtures of disperse dyes of the formula and to a process for the production of these dyes.

In Formula I R stands for a divalent aliphatic radical which may be interrupted by an oxygen bridge, X for O- or -NR acy for a non-water-solubilizing aliphatic or benzene carboxylic acid radical and R for lower alkyl radical, which may be substituted by an acetoxy group and in which the nucleus A may bear further non-water-solubilizing substiuents. The divalent aliphatic radical R may be branched, unbranched or cyclic 'aliphatic radical containing in all up to 8 carbon atoms.

Examples of suitable acyl radicals are the formyl, acetyl, propinoyl, butyryl and cyclohexylcarbonyl radicals, and a benzoyl radical which may be substituted, e.g. by a methoxy group; free carboxylic acid and sulphonic acid groups are excluded. The lower radical R is preferably an alkyl radical having 1 to 5 carbon atoms.

The preferred substituents on the nucleus A are halogen atoms, in particular chlorine or bromine atoms, methylsulphonyl and nitro groups. The dyes so substituted are preferably mixtures of molecules substituted in the 5 and 6 positions.

The dyes of Formula I are produced by reacting a compound of the formula ice with an organic acylating agent free from water-solubilizing groups. The exchange of the hydrogen in a radical of formula X-H for an acyl radical is effected preferably at temperatures between 100 and 180 C., if pre ferred in an inert solvent, for example chlorobenzene or nitrobenzene, or in an excess of the acylating agent, and if required in the presence of an acid-binding agent, for example alkali carbonates, alkali acetates or organic bases such as pyridine or dimethylaniline. The preferred acylating agents are acid anhydrides or acid halides, in particular the acid chlorides.

The new dyes are very suitable for use as disperse dyes. For this purpose they are comminuted until the average particle size is approximately 0.01 to 10 microns or more particularly, about 0.1 to 5 microns. Comminution can be carried out in the presence of dispersing agents and fillers. For example, the dried dye can be ground with a dispersing agent and if necessary with a filler, or it can be kneaded in paste form with a dispersing agent and subsequently vacuum or jet dried. The resulting dye preparations, after the addition of a suitable amount of water, can be employed for dyeing, padding or printing from long or short baths.

For dyeing in long baths up to about 10 grams dye per litre are generally used, for padding up to about 150 grams per litre or, preferably, 0.1 to grams per litre; and for printing up to about 150 grams per 1000 grams of print paste. The liquor ratio may vary within wide limits, for example from about 1:3 to 1:200 or preferably from 1:3 to 1:80.

From aqueous dispersion the dyes build up well on hydrophobic synthetic fibres and semi-synthetic fibres. They are particularly suitable for dyeing, padding and printing filaments, loose fibres, yarns, woven fabrics and knitted goods of linear aromatic polyesters. These are generally the polycondensation products of terephthalic acid and glycols, in particular ethylene glycol.

The known dyeing methods are used. Polyester fibres can be exhaustion dyed in the presence of carriers at temperatures of about 80 to C. at the higher temperatures under pressure, or alternatively in the temperature range of about 100 to C. without a carrier. These fibres can be pad dyed or printed with aqueous dispersions of the new dyes and the dyeings or prints fixed at about 140 to 230 C. by means of water vapour or hot air.

Generally a dispersing agent or a mixture of dispersing agents, preferably of anionic or nonionic character, is used. Often about 0.5 gram of dispersing agent per litre of the dyeing medium is sufficent, although greater amounts of up to about 3 grams per litre can be used. Examples of known and particularly suitable anionic dispersing agents are the condensation products of naphthalene-sulphonic acids and formaldehyde, notably the dinaphthylmethanedisulphonates, the esters of sulphonated succinic acid, Turkey red oil, the alkali salts of the sulphuric acid esters of fatty alcohols, e.g. sodium lauryl sulphate and sodium cetyl sulphate, sulphite cellulose waste lye or its alkali salts, soaps, and the alkali metal sulphates of the monoglycerides of fatty acids. Examples of known and very suitable non-ioninc dispersing agents are the adducts of about 3-40 moles ethyleneoxide and alkylphenols fatty alcohols or fatty amines and their neutral sulphuric acid esters.

In padding and printing applications the usual thickening agents are employed, for example modified natural products, such as sodium alignates, British gum, gum arabic, crystal gum, locust bean gum, gum tragacanth, carboxymethyl cellulose, hydorxyethyl cellulose and starches, or synthetic products such as polyacrylamides or polyvinyl alcohols.

The dyeings obtained have excellent all-around fastness, the fastness to light, water washing, pleating and thermofixation being especially noteworthy. Wool is well reserved.

The dyes are stable to mild reducing agents and under 4 dride and the mixture is held at 135 for 4 hours with constant stirring. On cooling to room temperature, the product is filtered off, washed with 5 parts of glacial acetic acid and then with 20 parts of 50% acetic acid, and well hydrolysing conditions are virtually unaffected even at 5 expressed. It is then stirred into 100 parts of water the 130 C. They are superior to the dyes disclosed in German resulting suspension is adjusted to pH 8-9- with sodium Pat. 1,049,821 in that they exhibit greater stability of hydroxide solution and boiled for a short time. The prodshade in hot wash baths and in dry heat treatments. net is again filtered 01f, washed with water until of neutral In the examples the parts and percentages are by weight reaction and dried at 100-110. The yield is 6.3 parts of and the temperatures in degrees centigrade. 10 a loose crystalline powder of golden yellow colour.

EXAMPLE 1 Thin layer chromatography shows that the product conslsts of two very similar components, one of which 1s pa of the conflensatloe Product f naphthoyleneidentical with the dye of the tabulated Example 4 and the benzlmldazole-l1,12-dwarb0Xyl1c anhydrlde other with the dye of Example 10 in the same table. iso-propanolamine are entered into 35 parts 0 proplomc anhydride. The reaction mixture is maintained at 140 EXAMPLE 3 for 3 hours with constant stirring and subsequently al- Four parts of the condensation product of naphthalowed to cool to room temperature. The reaction product ylenebenzimidiazole 11,12 dicarboxylic anhydride and is filtered 01f, washed with ethanol and expressed well. mono-iso-propanolamine are added to a mixture of 10 It is then stirred into 50 parts of water to form a suspenparts of acetic anhydride and 15 parts of propionic anhysion which is adjusted to pH 8-9 with 20% sodium hydried. The mixture is raised to 140 and stirred for 3 droxide solution, then boiled for a short time and filtered hours at this temperature, after which it is allowed to while still hot. The product is washed with water until cool to room temperature. The product 18. filtered oil, of neutral reaction and dried in a drying cabinet at 100- Washed Wlth ethanol, eXPICSSd Well and stirred into 50 110. A loose crystalline powder of pale golden yellow P 9 f- The P' 11115 91118135151011 1S lP to colour is obtained. On polyester fibres it gives dyeings of SOdlum hYdIQXIdG SOIUHOH and, after bolhng for yellow shade having excellent all-around fastness. a Whlle, the Product 18 filtered free, Washed W 9 6 E LE 2 until of neutral reaction and dried at 100ll0 C. A loose, XAMP bright yellow powder is obtained which gives yellow dye- Six parts of a mixture of the condensation products of ings of excellent fastness on polyester fibres. naphthoylenebenzimidazole-1l l2-dicarboxylic anhydride Further dyes conforming to the present invention bear and a 9:11 mixture of monoethanolamine and mono-isothe groups listed in the following table. propanolamine are entered into parts of acetic anhy- TABLE I Example A R; X Aeyl Shade on polyester 4 (CH2)2- O -COCH3 Yellow.

(CH2)2 -0- o o GHzOH: Reddish yellow.

( 2)a -0- C O CH; Yellow. (OH2)2 -O- -O OCHrGHzCHz Golden yellow.

(CH2)z' '1|Q'- C O OH: Neutral yellow.

(CH2) 0 o 0 CH3 (CH2)3 1TI- -00CH= Do.

(CH1) 0 C 0 CH;

--CH2CH -O- -C 0 CH3 Yellow.

CH2OH O-- -CHO Reddisll yellow.

CHGH2 -0- -OoCHi Yellow.

---CHCHi-- 0 -C 0 CH: Neutral yellow.

HzCHs -IOHCH2- -O -C O CzH5-- D0.

CHZCH;

OH2CH2OCH2CI'I2 -0 -CO0H; Golden yellow.

OH2CH20-CHzCHz- -0 -COO2I'I5 no,

--0- -C 0 Q2115 Reddlsll yellow. -CH3-CH -O G Yellow.-

--CO 0 CH:

-(GHZ)2- TABLE IIContlnued Example A R X Acyl -Shadeon polyester 37;.1; '(CH2)a III- A Same as'above.- 'Yellow.

38 -(CH2CH2)} O-' C CH Greenish yellow.

l .El. l 6 CH3 39 Same as above Same as above -O- C O CZHE Do.

DYEING EXAMPLE 1 and A fine aqueous dispersion is prepared with 30 parts of O the dye of Example 6, 70 parts of sodium dinaphthylmethane disulphonate and 3 parts of sodium alginate. It is made up to 100 parts with water and well mixed to form a padding liquor which is applied to a polyester fabric at The padded fabric is air dried at 60l00 and fixed by exposure for 60 seconds in dry air at 230. It is then rinsed, soaped, rinsed again and dried. A brilliant yellow dyeing with outstanding fastness properties is obtained.

DYEING EXAMPLE 2 A dyeing preparation isformed as described in the preceding example, using the dye of Example 8 in the table. 8 parts of this preparation are added to a dyebath of 4000 parts of water containing 2 parts of sodium lauryl sulphate in a high-temperature dyeing machine. 100 parts of a scoured fabric of polyester fibre are entered into the bath and dyed in the closed autoclave for 1 hour at 130- 140 C. After dyeing the fabric is rinsed, soaped, rinsed and dried. A deep yellow dyeing is obtained which has excellent fastness properties.

DYEING EXAMPLE 3 A mixture of 7 parts of the dye mixture obtained by the procedure of Example 2, 4 parts of sodium dinaphthylmethane disulphonate, 4 parts of sodium cetyl sulphate and 5 parts of anhydrous sodium sulphate is ground in a ball mill for 24 hours and subsequently passed through a sieve of 135 meshes/cm. fineness. 0.325 part of this dye preparation are added to a dyebath of 4000 parts of water containing 2 parts of sodium lauryl sulphate. 100 parts of a scoured fabric of polyester fibre are entered into the bath at 40-50, after which 20 parts of an aqueous 10% dispersion of ortho-phenylphenol are added. The bath is raised slowly to 100 and the fabric dyed for l-Z hours at 95100. On removal it is rinsed, soaped, rinsed again and dried. A brilliant dyeing of neutral yellow shade is obtained which has excellent fastness properties.

Formulae of representative dyestuffs of the foregoing examples are as follows:

EXAMPLE 1 The mixture consisting of N o t 0 CH -CO-OOHzCH N Q N EXAMPLE 29 The mixture consisting of Mn /N and EXAMPLE 6 wherein R has at most 8 carbon atoms and is selected from the group consisting of alkylene, cyclohexylene and alkylene-oxy-alkylene;

R is a member selected from the group consisting of lower alkyl and acetoxy(lower)alkyl;

Acyl is a member selected from the group consisting of formyl, acetyl, propionyl, butyryl, cyclohexylcarbonyl, benzoyl and methoxybenzoyl; and

nucleus A is either mono-substituted or unsubstituted, any

substituent thereon being selected from the group consisting of chloro, bromo, nitro and methylsulfonyl.

2. Dye of the formula and and

II II o o 6. Dye according to claim 1 of the formal N 0 1 2r Q 0 Ha-CO N- 'CH2 CH2N N c o CH2CH2 OCOCH3 H g References Cited UNITED STATES PATENTS 1,935,945 11/1933 -Echert et al. 260-282 2,965,644 12/1960 Echert et al. 260-282 3,362,958 1/1968 Schellhammer 260281 3,428,637 2/ 1969 Pfister 260-282 X FOREIGN PATENTS 1,281,609 10/1968 Germany 260282 DONALD G. DAUS, Primary Examiner U.S.Cl.X.R. 

